Unit 5: Uniform Circular Motion

Question 1

Uniform circular motion

Answer 1

motion at a constant speed in a circular path

Question 2

period

Answer 2

time required to complete one cycle

Question 3

direction of velocity for uniform circular motion

Answer 3

always tangent to the circle/point

Question 4

the direction of accelerated points for uniform circular motion

Answer 4

toward the center

Question 5

centripetal acceleration

Answer 5

acceleration pointing toward the middle of the circle

Question 6

Gravitational force

Answer 6

the attractive force between two objects that is directly proportional to the mass of the objects.

Question 7

Law of universal gravitation

Answer 7

states that gravitational force between any two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers

Question 8

Gravitational field

Answer 8

the field that surrounds any objects with mass; equals the universal gravitational constant, times the mass of the object, divided by the square of the distance from the object’s center.

Question 9

Inertial mass

Answer 9

a measure of an object’s resistance to any type of force

Question 10

Mass

Answer 10

a measure of inertia. More massive objects are more difficult to accelerate as they have greater inertia to overcome

Question 11

Weight

Answer 11

the gravitational force that an object experiences

Question 12

Centripetal acceleration

Answer 12

the center seeking acceleration of an object moving in a circle at a constant speed.
the rate at which the direction of the velocity is changing.

Question 13

Centripetal force

Answer 13

the net force exerted toward the central of the circle that causes an object to have a centripetal Acceleration.
the apparent force that seems to pull on a moving object, but does not exert a physical outward push on it, and is observed only in rotating frames of reference

Question 14

Centripetal

Answer 14

towards the center of the circle (inward). In uniform circular motion, the acceleration is centripetal and at least one force is centripetal or has an inward component.

Question 15

Centrifugal

Answer 15

away from the center of the circle (outward). A person traveling in a circle has a perception of being pushed outward. This perception is called centrifugal force, but what the person perceives is just a consequence of inertia

Question 16

Hypotenuse

Answer 16

the longest side of a right triangle.

Question 17

pythagorean theorem

Answer 17

the sum of the squares of the legs of any right triangle equals the square of the hypotenuse.

Question 18

torque

Answer 18

a measure of the force that can cause an object to rotate about an axis

Question 19

Fulcrum

Answer 19

a point of support upon which a rigid body may rotate

Question 20

momentum

Answer 20

product of mass and velocity (mass x velocity)

Question 21

Inertia

Answer 21

the natural tendency of any object to maintain constant momentum

Question 22

kinetic energy

Answer 22

The work needed to accelerate a body of a given mass from rest to its stated velocity

Question 23

Newton’s second law for rotational motion

Answer 23

states that the angular acceleration of an object is directly proportional to the net torque and inversely proportional to the moment of inertia